具有正则Gδ对角线空间的注记(英)

A Note on Spaces with Regular Gδ-Diagonals

英文关键词:regular G_δ-diagonal  finite-to-one map  open map  submentrizable space

中文摘要:

      这篇简短的注记使用Mysior的例子说明具有正则G_δ对角线的空间不被有限到一的开映射保持．

英文摘要:

      In this short note, using a Mysior′S example shows that a space with a regular G_δ-diagonal is not preserved by a finite-to-one and open map.